IMAGE QUALITY COMPENSATION DEVICE AND METHOD OF ORGANIC LIGHT EMITTING DISPLAY

An organic light emitting display device according to the present invention comprises an organic light emitting diode (OLED); a driving thin film transistor (TFT) including a gate electrode connected to a node A, a source electrode connected to a node B, and a drain electrode connected to a node C and controlling a current applied to the OLED; a first switch TFT switching a current path between the node A and a data line according to a first scan signal to initialize the node A; a second switch TFT switching a current path between the node B and the data line according to a second scan signal; a third switch TFT switching a current path between the node A and the node C according to the second scan signal to sample a threshold voltage of the driving TFT; a fourth switch TFT connecting an input terminal of a high potential driving voltage to the node B in response to a light emission control signal; a fifth switch TFT switching a current path between the node C and the OLED according to the light emission control signal; and a storage capacitor connected between the input terminal of the high potential driving voltage and the node A.